From 0913c3d46b180e40867e7de6a062582acd1902e9 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sat, 16 Apr 2016 20:53:08 -0400
Subject: link mode: .deps file generation: initial implementation.

---
 include/slibtool/slibtool.h |  1 +
 src/logic/slbt_exec_ctx.c   |  3 +++
 src/logic/slbt_exec_link.c  | 58 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index 265ba49..24dd8be 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -100,6 +100,7 @@ struct slbt_exec_ctx {
 	char ** lout[2];
 	char ** sentinel;
 	FILE *	fwrapper;
+	FILE *	fdeps;
 	char *	csrc;
 	char *	ldirname;
 	char *	lbasename;
diff --git a/src/logic/slbt_exec_ctx.c b/src/logic/slbt_exec_ctx.c
index 39fa26c..37bb475 100644
--- a/src/logic/slbt_exec_ctx.c
+++ b/src/logic/slbt_exec_ctx.c
@@ -329,6 +329,9 @@ static int slbt_free_exec_ctx_impl(
 	if (ictx->ctx.fwrapper)
 		fclose(ictx->ctx.fwrapper);
 
+	if (ictx->ctx.fdeps)
+		fclose(ictx->ctx.fdeps);
+
 	free(ictx->args);
 	free(ictx->shadow);
 	free (ictx);
diff --git a/src/logic/slbt_exec_link.c b/src/logic/slbt_exec_link.c
index 501486f..3fd35ad 100644
--- a/src/logic/slbt_exec_link.c
+++ b/src/logic/slbt_exec_link.c
@@ -245,6 +245,56 @@ static int slbt_exec_link_remove_file(
 	return -1;
 }
 
+static int slbt_exec_link_create_dep_file(
+	struct slbt_exec_ctx *	ectx,
+	char **			altv,
+	const char *		libfilename)
+{
+	char **	parg;
+	char *	popt;
+	char *	plib;
+	char	depfile[PATH_MAX];
+
+	if (ectx->fdeps)
+		fclose(ectx->fdeps);
+
+	if ((size_t)snprintf(depfile,sizeof(depfile),"%s.slibtool.deps",
+				libfilename)
+			>= sizeof(depfile))
+		return -1;
+
+	if (!(ectx->fdeps = fopen(depfile,"w")))
+		return -1;
+
+	for (parg=altv; *parg; parg++) {
+		popt = 0;
+		plib = 0;
+
+		if (!strcmp(*parg,"-l")) {
+			popt = *parg++;
+			plib = *parg;
+		} else if (!strcmp(*parg,"--library")) {
+			popt = *parg++;
+			plib = *parg;
+		} else if (!strncmp(*parg,"-l",2)) {
+			popt = *parg;
+			plib = popt + 2;
+		} else if (!strncmp(*parg,"--library=",10)) {
+			popt = *parg;
+			plib = popt + 10;
+		}
+
+		if (plib)
+			if (fprintf(ectx->fdeps,"-l%s\n",plib) < 0)
+				return -1;
+	}
+
+	if (fflush(ectx->fdeps))
+		return -1;
+
+	return 0;
+}
+
 static int slbt_exec_link_create_archive(
 	const struct slbt_driver_ctx *	dctx,
 	struct slbt_exec_ctx *		ectx,
@@ -298,6 +348,10 @@ static int slbt_exec_link_create_archive(
 	if (slbt_exec_link_remove_file(dctx,ectx,output))
 		return -1;
 
+	/* .deps */
+	if (slbt_exec_link_create_dep_file(ectx,ectx->cargv,arfilename))
+		return -1;
+
 	/* ar spawn */
 	if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
 		return -1;
@@ -413,6 +467,10 @@ static int slbt_exec_link_create_library(
 		if (slbt_output_link(dctx,ectx))
 			return -1;
 
+	/* .deps */
+	if (slbt_exec_link_create_dep_file(ectx,ectx->argv,dsofilename))
+		return -1;
+
 	/* spawn */
 	if ((slbt_spawn(ectx,true) < 0) || ectx->exitcode)
 		return -1;
-- 
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